METHOD OF PRODUCING OXYETHYLATED ALKYLPHENOL-BASED ANIONIC SURFACTANTS Russian patent published in 2010 - IPC C07C51/367 C07C59/70 C11D1/06 

FIELD: chemistry.

SUBSTANCE: invention relates to production of anionic surfactants, specifically to methods of producing carboxymethylates of oxyethylated alkylphenols used as components of detergents for domestic and industrial purposes - intensification of oil extraction processes by increasing ratio of extraction of oil from oil deposits. The method of producing oxyethylated alkylphenol-based anionic surfactants is realised through condensation of oxyethylated alkylphenols with sodium monochloroacetate in molar ratio 1.0:(0.8-1.0) in nitrogen medium while heating in the presence of an alkaline agent at 45-50°C. The alkaline agent used is crystalline potassium hydroxide taken in molar ratio to the oxyethylated alkylphenol equal to (0.7-1.0):1.0 or its mixture with crystalline sodium hydroxide in the same molar ratio to the oxyethylated alkylphenol. After condensation, a hydrogen ion concentration (pH) regulator is added to the reaction mixture in molar ratio of pH regulator to the oxyethylated alkylphenol equal to (0.01-0.1):1.0 until attaining pH of the reaction mixture of 8.0-9.0. The anionic surfactant is stored without partial decomposition and resin formation for not less than 100 days.

EFFECT: efficient method of producing anionic surfactants.

4 cl, 1 tbl, 15 ex